Development of Active Hear-Through Equalization Algorithm for Earphones

This research developed an active hear-through equalization (AHE) algorithm for earphones. Using a digital signal processor as the computing core, this proposed work put a microphone on the housing of the earphone to receive ambient sound and then created a pseudo-ambient sound in the eardrum of the human ear to achieve the hear-through (HT) function. In addition, this research analyzed the dependence on the direction-of-arrival (DOA) for the HT function. Finally, we compared the performance of the proposed work with the leading commercial earphones to verify its enhancement.